@Override
public ComputeEngineContainer start(Props props) {
this.level1 = new ComponentContainer();
this.level1
.add(props.rawProperties())
.add(LEVEL_1_COMPONENTS)
.add(toArray(CorePropertyDefinitions.all()))
.add(toArray(CePropertyDefinitions.all()));
configureFromModules(this.level1);
this.level1.startComponents();
ComponentContainer level2 = this.level1.createChild();
level2.add(LEVEL_2_COMPONENTS);
configureFromModules(level2);
level2.startComponents();
ComponentContainer level3 = level2.createChild();
level3.add(LEVEL_3_COMPONENTS);
configureFromModules(level3);
level3.startComponents();
this.level4 = level3.createChild();
this.level4.add(LEVEL_4_COMPONENTS);
configureFromModules(this.level4);
ServerExtensionInstaller extensionInstaller =
this.level4.getComponentByType(ServerExtensionInstaller.class);
extensionInstaller.installExtensions(this.level4);
this.level4.startComponents();
startupTasks();
return this;
}